公开(公告)号：US20170366123A1

公开(公告)日：2017-12-21

申请号：US15619128

申请日：2017-06-09

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Sooping Saw ,  Rakesh Raja ,  Anuj Jain ,  Matthew Hein

IPC: H02P8/14

CPC classification number: H02P8/14

Abstract: In a described example an apparatus includes: an FET driver circuit configured to supply current to a coil in a stepper motor, the FET driver circuit configured to regulate the current to the coil using a fixed delta current; a current chopper pulse width modulated circuit coupled to the FET driver circuit configured to supply pulses corresponding to a step control signal and a direction control signal; a back electromotive force (BEMF) monitor coupled to the current chopper circuit configured to measure an off time pulse and to output a BEMF monitor signal; and a controller coupled to the current chopper pulse width modulated circuit to supply the step and direction control signals and coupled to receive the BEMF monitor signal.

公开(公告)号：US10063170B2

公开(公告)日：2018-08-28

申请号：US15619128

申请日：2017-06-09

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Sooping Saw ,  Rakesh Raja ,  Anuj Jain ,  Matthew Hein

IPC: H02P8/14

CPC classification number: H02P8/14 ,  H02P6/182

Abstract: In a described example an apparatus includes: an FET driver circuit configured to supply current to a coil in a stepper motor, the FET driver circuit configured to regulate the current to the coil using a fixed delta current; a current chopper pulse width modulated circuit coupled to the FET driver circuit configured to supply pulses corresponding to a step control signal and a direction control signal; a back electromotive force (BEMF) monitor coupled to the current chopper circuit configured to measure an off time pulse and to output a BEMF monitor signal; and a controller coupled to the current chopper pulse width modulated circuit to supply the step and direction control signals and coupled to receive the BEMF monitor signal.